Parkinson's disease
Parkinson's disease is a progressive disorder of the nervous system that affects movement — tremor, stiffness, and slowed motion. It is one of the conditions the VA presumes is linked to Agent Orange exposure.
How the VA looks at Parkinson's disease
VA rating schedule, diagnostic code 8004
The VA treats Parkinson's disease as a neurological condition. It is rated under the schedule for neurological conditions in 38 CFR § 4.124a, using Diagnostic Code 8004, which the rules call "paralysis agitans." When a veteran has clear, ascertainable residuals from the disease, the VA assigns a minimum rating of 30 percent, and the rating can scale higher from there. The rules say disabilities from these conditions are rated in proportion to how much they affect motor, sensory, or mental function, and residuals such as tremor, stiffness, or trouble walking can be rated under the related diagnostic codes 8000 through 8025. So what the VA looks at is not just the diagnosis, but how the symptoms actually affect the person.
Parkinson's disease also has a special pathway tied to exposure. Under 38 CFR § 3.309(e), it is on the list of conditions the VA presumes are connected to certain herbicide agents, such as Agent Orange. In plain terms, if a veteran was exposed to a qualifying herbicide agent during service and meets the requirements in 38 CFR § 3.307, the VA can presume the Parkinson's disease is service-connected even without a record of it during service. This presumption is rebuttable, meaning the VA still applies the conditions set out in those rules.
This is general educational information about how the VA's rules work — not legal advice, not a VA decision, and not a prediction about any individual claim. Outcomes depend on your own facts and evidence; a denial can be appealed.
Sources
- 38 CFR § 4.124a — Schedule of ratings, neurological conditions (DC 8004 paralysis agitans, minimum 30%) — 38 CFR § 4.124a (opens in a new tab)
- 38 CFR § 3.309(e) — Diseases associated with herbicide exposure (Parkinson's disease) — 38 CFR § 3.309(e) (opens in a new tab)
- 38 CFR § 3.307 — Presumptive service connection (herbicide agents) — 38 CFR § 3.307 (opens in a new tab)
Grounded in federal regulations and VA guidance, independently reviewed June 2026. Educational information, not legal advice or a VA determination.
Across 1,923 real Board appeals for Parkinson's disease
68% were granted, partly granted, or remanded.
A denial is often not the end — remands are sent back for more development and frequently end in a grant.
- Granted 31%
- Partly granted 7%
- Remanded 31%
- Denied 23%
- Dismissed 8%
What tends to win
Among the appeals that were granted or partly granted, the most common ways Parkinson's disease was linked to service:
- Direct service connection305
- Presumptive (no nexus needed)286
- Reopened with new & material evidence53
How it’s rated, in practice
When Parkinson's disease was granted, the rating most often assigned was:
- 100% (91)
- 30% (32)
- 50% (25)
- 70% (16)
- 0% (9)
Presumptive & exposure paths
These appeals involved a recognized exposure — which can mean the link to service is presumed, with no nexus to prove:
- Agent Orange / herbicides192
- Burn pits & airborne hazards185
- PACT Act136
- Camp Lejeune water65
- Gulf War48
Real decisions
- Granted
The Board granted service connection for Parkinson's disease, which is presumed to have been incurred in active service due to exposure to contaminated water at Camp Lejeune.
- Granted
The Board granted an effective date of August 25, 2016 for the award of service connection for Parkinson's disease.
- Granted
The Veteran is granted special monthly compensation (SMC) at the (r)(2) level due to his service-connected disabilities requiring a higher level of care.
- Granted
The Veteran's combined disability rating for Parkinson's disease and its manifestations is 100 percent, and special monthly compensation at the rate set forth in 38 U.S.C. § 1114(r)(1) is granted.
- Granted
The Board granted an effective date of February 8, 2022, for the grant of service connection for Parkinson's Disease based on continuous pursuit and evidence of symptoms prior to formal diagnosis.
- Granted
The Board granted an effective date of November 20, 2018, for the awards of increased ratings to 50 percent for left upper extremity involvement and 40 percent for right upper extremity involvement associated with Parkinson's disease.
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This is general information, not legal advice. For advice about your own situation, talk to a VA-accredited representative — many help for free.